Answers (3)

I am of the opinion that it would be faulty to assume that only muscles such as the rotator cuff muscles and the pectorals are responsible for stabilization of the glenohumeral joint. Ligaments are also involved.

As an example, if a person dislocated their shoulder, the coracohumeral, coracoacromial or the capsular ligaments might be compromised. If this happens glenohumeral joint stability is compromised.

According to NASM's Essentials of Corrective Exercise Training the dynamic stabilizers of the "glenohumeral joint is dependent on the musculature that surrounds the joint, including the rotator cuff and scapular stabilizers."